Large file uploads via PHP

[John Miller <jmiller@thecsl.org>]

We have a user who wants to upload podcasts to her website via PHP forms 
(Wordpress & Drupal).  Some of the podcasts are in the 60-minute+ range 
and take up over 100MB.  Has anyone on the list had experience with this 
sort of thing?

Our setup:
Dell PowerEdge 2400, 700MHz P3, 1.25 GB RAM, running stock Sarge 
2.6.8-3-686 SMP kernel
Apache 1.3.33 (standard Sarge build)
PHP 4.3.10-18 (via suphp package), running as CGI

Thus far, I've modified the following php settings:

upload_max_size 250M
post_max_size 500M
memory_limit 500M
max_execution_time 3600

and the following Apache setting:
Timeout 3600

I had to modify Firefox as well, via about:config.

After all this mucking around, the file still took 20 minutes to 
upload--over our LAN, no less!  While the file was being written to the 
upload_tmp_dir (/tmp), the php4 process gobbled over 100MB RAM.  If this 
only happened once a day, we might be able to live with it, but ten 
concurrent uploads of this size would pretty much bring things to a 
halt.  How have you all handled this?

--John